Crinoid Stem – Lancashire

Fossil crinoid stems from Clitheroe, located in Lancashire, UK, the stems are dated to the Silurian period, making them between 443 to 416 million years old. Crinoids are regarded as living fossils, they belong to the echinoderm family, along with other marine fauna including sea urchins and star fish, as species are still alive today, analysis of them indicates that very little of their anatomy has changed in hundred of millions of years. These particular samples are fairly large in length, between 40 to 60 mm and in diameter. Making them excellent for both collectors and educational use, as morphological features such as the stems individual segments can easily be seen with out magnification. The samples are our old stock, once they are gone, we will likely never obtain more again from this location. They will come supplied in a card tray with an information label.